單項選擇題

A combination or all-purpose nozzle produces（）.

A.low-velocity fog only
B.a solid stream only
C.a solid stream and foam
D.a solid stream and fog

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單項選擇題

A CO₂ portable extinguisher is annually checked by（）.

A.reading the gage pressure
B.weighing the extinguisher
C.discharging a small amount of CO₂
D.seeing if the seal has been broken

單項選擇題

A CO₂ extinguisher on a ship which has lost 10% of its charge must be（）.

A.used at the earliest opportunity
B.hydrotested
C.recharged
D.weighed again in one month